There is a way to check if Hibernate method .saveOrUpdate() did an insert or update?

Question

How can I know if Hibernate did an insert or update AFTER run getHibernateTemplate().saveOrUpdate(object); the method is void!

saveOrUpdate() does the following:

• if the object is already persistent in this session, do nothing
  
• if another object associated with the session has the same identifier, throw an exception
  
• if the object has no identifier property, save() it
  
• if the object's identifier has the value assigned to a newly instantiated object, save() it
  
• if the object is versioned by a or , and the version property value is the same value assigned to a newly instantiated object, save() it
  
• otherwise update() the object

I'm afraid I always have to check if the object already have a 'primary key/id' BEFORE run this method, is this the only way? If yes, how can I get the primary key/ID in a generic way?

Serializable id = session.getIdentifier(entity); or Object id = entityManagerFactory.getPersistenceUnitUtil().getIdentifier(entity); ??

Answer 1

Yes, Checking the Identifier associated with an entity in the persistence context means we are checking if the entity is in persistent state or not. Since u have already referred the documentation i would suggest please have look at this question, Hibernate saveOrUpdate behavior - have a look at Olaf's answer, it explains how it works in short and sweet way.

with JPA 2.0 we have the

Object id = entityManagerFactory.getPersistenceUnitUtil().getIdentifier(entity); way of checking.

However your question is tagged for hibernate, so the first one is correct.

Serializable id = session.getIdentifier(entity);